Technical Reference; Dhcp Snooping Overview - ZyXEL Communications XS3800-28 User Manual

The following table describes the labels in this screen.
Table 131 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure > VLAN > Port
L ABEL
VID
Port
Option 82 Profile
Add
Cancel
Clear
Index
VID
Port
Profile Name
Delete
Cancel
28.4 T e c hnic a l Re fe re nc e
This section provides technical background information on the topics discussed in this chapter.
28.4.1 DHC P Sno o ping O ve rvie w
Use DHCP snooping to filter unauthorized DHCP packets on the network and to build the binding table
dynamically. This can prevent clients from getting IP addresses from unauthorized DHCP servers.
Chapter 28 DHCP Snooping
DESC RIPT IO N
Enter the ID number of the VLAN you want to configure here.
Enter the number of ports to which you want to apply the specified DHCP option 82 profile.
You can enter multiple ports separated by (no space) comma (,) or hyphen (–) for a range.
For example, enter "3–5" for ports 3, 4, and 5. Enter "3,5,7" for ports 3, 5, and 7.
In stacking mode, the first number represents the slot and the second the port number. Enter
1/1–1/24,2/23 for ports 1 to 24 for the Switch in slot 1 and port 23 for the Switch in slot 2, for
example.
Select a pre-defined DHCP option 82 profile that the Switch applies to the specified ports in
this VLAN. The Switch adds the information (such as slot number, port number, VLAN ID and/
or system name) specified in the profile to DHCP requests that it broadcasts to the DHCP
VLAN, if specified, or VLAN. You can specify the DHCP VLAN in the
screen.
Note: The profile you select here has priority over the one you select in the
>
Sno o ping C o nfig ure
Click this to create a new entry or to update an existing one.
This saves your changes to the Switch's run-time memory. The Switch loses these changes if it
is turned off or loses power, so use the
changes to the non-volatile memory when you are done configuring.
Click this to reset the values above based on the last selected entry or, if not applicable, to
clear the fields above.
Click to reset the fields to the factory defaults.
C le a r
This field displays a sequential number for each entry. Click an index number to change the
settings.
This field displays the VLAN to which the ports belongs.
This field displays the ports to which the Switch applies the settings. In stacking mode, the first
number represents the slot and the second the port number.
This field displays the DHCP option 82 profile that the Switch applies to the ports.
Select the entries that you want to remove in the
button to remove the selected entries from the table.
Click this to clear the
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> screen.
VL AN
link on the top navigation panel to save your
Sa ve
De le te
check boxes above.
DHC P Sno o ping C o nfig ure
DHC P
column, and then click the
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